CAT2000
GSM Evolution Towards UMTS
IFT6275
Shouwen ZhangFuman Jin
GPRS: General Packet Radio Service
IMT- 2000 Goals
Global system for wireless communications Multi-environment operation
Vehicular Pedestrian and Outdoor-to-Indoor Indoor Office Satellite
Support for packet data and circuit-switched services Multimedia services support Expected data rates:
144 kbps in vehicular 384 kbps in pedestrian 2 Mbps in indoor office environment
IMT- 2000 spectrum allocated at WARC 1992
in the 2 GHz band Year 2000+ services (subject to market considerations)
GPRS: General Packet Radio Service
Low cost
Light weight
Low power drain / long talk time
Toll-quality voice
High security
Use multiple devices with the same User ID
Services, routing and charging by personal ID/subscription
International roaming
Broad range of services
Fixed and mobile
Voice, data, multimedia
IMT-2000 End User Terminal Requirements
GPRS: General Packet Radio Service
IMT- 2000 Key Architectural Requirements
Broadband Radio Access Data Rates: 144, 384, 2000 kbps
Evolution from 2G (CDMA, TDMA, GSM, PHS, etc.)
Mobility vs. Fixed Wireless Access
Harmonized Spectrum Allocations
Broadband Backbone Infrastructure Integrated Voice, Data, Image
Network Architecture Functional Distribution
WIN, GSM MAP, INAP
GPRS: General Packet Radio Service
Third-Generation Systems Design Goals
Meet IMT-2000 requirements
Offer additional capacity and service enhancements as an evolution of
2G systems (TDMA based GSM and IS-95 / ANSI-41 based CDMA)
Integrated voice and data system
Optimized for voice and packet services
Support higher rate circuit services
Smooth, backwards-compatible evolution from existing 2G systems
Evolve network infrastructure and software from 2G systems
New dual-mode terminals allow gradual build-up of high data rate services in 2G
service areas
Coexistence of 2G voice and data terminals with new wideband terminals
GPRS: General Packet Radio Service
Third-Generation Capabilities for Wideband Wireless multi-media
Wide-band “bit pipe” between service providers and end-users
up to 384 kb/s in wide areas
up to 2 Mb/s in limited areas
IP connectivity from end-to-end
Data ( and Voice)
Real-time and non real-time
High bit-rate Services
at least 384 kb/s wide area
up to 2 Mb/s in indoor environment
Multimedia Applications
Optimized for Packet-data transfer/internet access
Migration Paths
GPRS: General Packet Radio Service
GPRS
GPRS Packet-based wireless communication
service New bearer service for GSM evolutionary step toward Enhanced Data
GSM Environment and Universal Mobile Telephone Service
GPRS: General Packet Radio Service
Benefits
Higher data rates
Using all 8 Packet Data Channels (PDCH) GPRS can achieve
up to 171.2kbps (theoretical maximum)
Packet switched principle
efficient for burst traffic (e.g., Internet traffic)
radio channel only be allocated when needed
spectrum efficiency
User-friendly billing
payment based on the amount of transmitted data
GPRS: General Packet Radio Service
GPRS
How to implement GPRS from GSM network:
8 Packet Data Channels (PDCH)Gateway GPRS Support Node (GGSN)Serving GPRS Support Node (SGSN)--
GSM terminal change to have a GPRS protocol stack and application softwareA Packet Control Unit (PCU) is added to each Base Station Subsystem (BSS)
Radio link ContolMedia Access ControlRadio resource configuration and channel assignment
GPRS: General Packet Radio Service
GPRS System Architecture
GPRS: General Packet Radio Service
SGSN
Serving GPRS Support Node
perform mobility management for GPRS mobile stations
manage the logical link to mobile stations
route and transfer packets between mobile stations and the
GGSN (Gateway GPRS Support Node)
handle PDP(Packet Data Protocol (IP and X.25)) contexts
inter-work with the radio resource management in the BSS
authentication
charging (billing customers)
GPRS: General Packet Radio Service
GGSN
Gateway GPRS Support Node
function as a border gateway between the GPRS network and
the packet data network (e.g., IP and X.25)
set up communications with the packet data network
route and tunnel packets to and from the SGSN
mobility management
authentication
charging
GPRS: General Packet Radio Service
Services
Bearer services PTP(Point-To-Point)
transfer data packets between two users
connectionless mode (e.g., for IP)
connection-oriented mode (e.g., for X.25)
PTM(Point-To-Multi-point): not available yet transfer data packets from one user to multiple users
multicast service
group call service
Supplementary services call forwarding unconditional
GPRS: General Packet Radio Service
Routing
GPRS Routing Example
GPRS: General Packet Radio Service
Routing
MS SGSN GGSN Hostlogical link
tunnelInternet/PDNPackt
IP datagramIP datagram
GPRS Network IP Network
GPRS: General Packet Radio Service
Logical Channels
Group Channel Function Direction
Packet datatraffic channel
PDTCH Data traffic MS BSS
Packet broadcastcontrol channel
PBCCH Broadcast control MS BSS
Packet commoncontrol channel(PCCCH)
PRACHPAGCHPPCHPNCH
Random accessAccess grantPagingNotification
MS BSSMS BSSMS BSSMS BSS
Packet dedicatedcontrol channel
PACCHPTCCH
Associated controlTiming advancecontrol
MS BSSMS BSS
Enhanced Data rates for GSM Evolution (EDGE)
200 kHz carrier spacing Reach up to 384kbps 8 TDMA time-slot Modulation Format
8-PSK as opposed to GMSK (in GPRS, HSCSD) 8-PSK:encodes 3 bits per modulated symbol
GMSK: 1 bit per symbol Edge transceiver unit need to be added to each cell Edge terminal--upgrade to use EDGE network
functionality
GPRS: General Packet Radio Service
EDGE System Architecture
GPRS: General Packet Radio Service
UMTS
384 kbps data capability to satisfy the IMT-2000 requirements
for pedestrian(microcell) and low speed vehicular (macrocell)
environments .
144 kbps data capability for high speed vehicular environment
2 Mbps requirement for indoor office is met by using wide band
EDGE (1.6 MHz) carrier
Path Suggested
GSM Path to 3GHSCSD is not necessary. GPRS is already available.
GPRS is ten times faster than HSCSD.GPRS expect to be able to offer higher data rates without building too
many new sites.
EDGE follows GPRS and allow a quick and cheap rollout of fast mobile service.
GSM->GPRS->EDGE->UMTS:smooth evolutioncost-effective
Conclusion
GPRS will be deployed cost-effectively in GSM first.
EDGE will follow GPRS to be deployed as a quick and cheaprollout of fast mobile service.
UMTS will finally be deployed upon EDGE.